Carl,
I'm curious why you recommend putting the cells in parallel at the bottom level of the hierarchy, and then building up series strings.
If you do that, you will no longer be able to monitor the voltage level of individual cells - only of the groupings of paralleled cells.
I would guess that you don't like putting strings of series cells in parallel, as you can get differences in discharge between the cells. But at least that could be measured and monitored.
The other nice thing about putting series strings in parallel is that it gives you the ability to add more series strings, or switch in/out strings. (i.e. if you wanted to run out on one string, and save the second string as a "backup" or "get home" string...)
John
On Monday, September 17, 2018, 8:11:33 AM CDT, carl.barlev@gmail.com [electricboats] <electricboats@yahoogroups.com> wrote:
Hi John,
In response to the last question in your original post, I think it is much better to parallel the cells and then connect the parallel blocks in series. Or even use combination of parallel and series at the same time.
It's also worth paying attention to the path current will flow through each parallel block, such that it always flows through the same length of busbar (or cable), regardless which of the parallel cell it flows through. Otherwise some cells will get loaded more than others and contribute to bringing your pack out of balance sooner.
I strongly advise against parallel connecting series strings (ie - do not connect strings in parallel).
Cheers,
Carl
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Posted by: oak <oak_box@yahoo.com>
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